EP2123095A2 - Method and apparatus for controlling discontinuous transmission and reception - Google Patents

Method and apparatus for controlling discontinuous transmission and reception

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Publication number
EP2123095A2
EP2123095A2 EP07862337A EP07862337A EP2123095A2 EP 2123095 A2 EP2123095 A2 EP 2123095A2 EP 07862337 A EP07862337 A EP 07862337A EP 07862337 A EP07862337 A EP 07862337A EP 2123095 A2 EP2123095 A2 EP 2123095A2
Authority
EP
European Patent Office
Prior art keywords
offset
drx
dtx
controlling
reception
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP07862337A
Other languages
German (de)
French (fr)
Other versions
EP2123095B1 (en
Inventor
Paul Marinier
Christopher R. Cave
Eldad M. Zeira
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
InterDigital Technology Corp
Original Assignee
InterDigital Technology Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by InterDigital Technology Corp filed Critical InterDigital Technology Corp
Priority to EP10167545A priority Critical patent/EP2227059B1/en
Publication of EP2123095A2 publication Critical patent/EP2123095A2/en
Application granted granted Critical
Publication of EP2123095B1 publication Critical patent/EP2123095B1/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H04W76/20—Manipulation of established connections
    • H04W76/28—Discontinuous transmission [DTX]; Discontinuous reception [DRX]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W48/00—Access restriction; Network selection; Access point selection
    • H04W48/08—Access restriction or access information delivery, e.g. discovery data delivery
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. Transmission Power Control [TPC] or power classes
    • H04W52/02—Power saving arrangements
    • H04W52/0209—Power saving arrangements in terminal devices
    • H04W52/0212—Power saving arrangements in terminal devices managed by the network, e.g. network or access point is leader and terminal is follower
    • H04W52/0216—Power saving arrangements in terminal devices managed by the network, e.g. network or access point is leader and terminal is follower using a pre-established activity schedule, e.g. traffic indication frame
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/04—Wireless resource allocation
    • H04W72/044—Wireless resource allocation based on the type of the allocated resource
    • H04W72/0446—Resources in time domain, e.g. slots or frames
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/12—Wireless traffic scheduling
    • H04W72/1263—Mapping of traffic onto schedule, e.g. scheduled allocation or multiplexing of flows
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/20—Control channels or signalling for resource management
    • H04W72/23—Control channels or signalling for resource management in the downlink direction of a wireless link, i.e. towards a terminal
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/20—Control channels or signalling for resource management
    • H04W72/23—Control channels or signalling for resource management in the downlink direction of a wireless link, i.e. towards a terminal
    • H04W72/231—Control channels or signalling for resource management in the downlink direction of a wireless link, i.e. towards a terminal the control data signalling from the layers above the physical layer, e.g. RRC or MAC-CE signalling
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W88/00—Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
    • H04W88/08—Access point devices
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
    • Y02D30/00—Reducing energy consumption in communication networks
    • Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks

Definitions

  • the present invention is related to wireless communications.
  • CPC is a mode that a user equipment (UE) is allocated with resources, but transmits and/or receives discontinuously, (i.e., transmits and/or receives only in a subset of uplink and downlink sub-frames), during data inactivity while continuous operation is possible, (i.e., may transmit and receive in all sub-frames), whenever needed.
  • the discontinuous uplink transmission and downlink reception increases system capacity and battery life of the UE.
  • a higher layer e.g., radio resource control (RRC) layer
  • RRC radio resource control
  • DTX discontinuous transmission
  • DRX discontinuous reception
  • One of the parameters is "UE_DTX_DRX_Offset" that jointly controls an uplink dedicated physical control channel (DPCCH) transmission offset and a downlink high speed shared control channel (HS- SCCH) reception offset in sub-frames.
  • DPCCH uplink dedicated physical control channel
  • HS- SCCH downlink high speed shared control channel
  • DTX and DRX may be used for different applications.
  • One of the applications is voice over Internet protocol (VoIP).
  • VoIP voice over Internet protocol
  • the UE may be inactive in reception and/or transmission during a significant fraction of the time not only during uplink and downlink silence periods but also during voice active periods under certain conditions.
  • enabling DTX results in the UE transmitting the uplink DPCCH only according to the transmission pattern provided that certain conditions are satisfied, (e.g., no enhanced dedicated channel (E-DCH) transmission, no need to transmit pre-amble or post-amble, no high speed dedicated physical control channel (HS-DPCCH) transmission, and the like).
  • the transmission pattern is defined based on the UE_DTX_DRX_Offset and a connection frame number (CFN) of the UE.
  • Enabling DTX results in a direct capacity improvement since less interference is generated on the uplink.
  • Such reduction of interference is achieved even during voice-active periods on the uplink if the UE is sufficiently close to a Node-B to be able to use a 2 ms transmission time interval (TTI), because not all hybrid automatic repeat request (HAKQ) processes need to be used with the voice application with the 2 ms TTI.
  • TTI transmission time interval
  • HAKQ hybrid automatic repeat request
  • enabling DRX results in the UE turning on its receiver only during user or control data reception and for a defined period afterwards, after which the UE is allowed to turn its receiver off according to a reception pattern. This allows the UE to save battery during voice-inactive periods on the downlink.
  • the RRC may configure DRX with the parameter Inactivity_Threshold_for_UE_DRX_cycle set to 0 sub- frame and the UE_DRX_cycle parameter set to 4 sub-frames. Thereafter, the Node B may schedule transmission for the UE only during the sub-frames where the UE should wake-up according to the pattern (1 out of 4).
  • the UE_DTX_DRX_Offset is set by a higher layer, such as RRC. This means that during the course of a voice connection, the UE_DTX_DRX_Offset parameter remains to a fixed value.
  • RRC Radio Resource Control
  • the fact that the UE_DTX_DRX_Offset parameter is fixed is sub-optimal from the system capacity point-of-view because the system capacity may only be maximized if the set of voice-inactive UEs have staggered transmission patterns (with approximately equal number of voice-inactive UEs transmitting the DPCCH at a given time). This situation cannot be realized with a fixed UE_DTX_DRX_Offset since the set of voice-inactive UEs changes dynamically.
  • a method and apparatus for controlling discontinuous transmission and reception are disclosed.
  • a Node-B schedules an offset for DTX and/or DRX for a UE and sends the offset to the UE.
  • the UE then shifts the DTX and/or DRX pattern based on the received offset.
  • the UE may modify the offset based on the transmission time of an activation command for DTX and DRX.
  • the UE may modify an offset for DTX and DRX to shift the DTX pattern and DRX pattern when the UE receives downlink data or transmits uplink data based on a sub- frame number at the time of the downlink reception and uplink transmission.
  • Figure 1 shows an example UE and Node-B that are configured to control DTX and/or DRX.
  • the terminology “UE” includes but is not limited to a wireless transmit/receive unit (WTRU), a mobile station, a fixed or mobile subscriber unit, a pager, a cellular telephone, a personal digital assistant (PDA), a computer, or any other type of user device capable of operating in a wireless environment.
  • WTRU wireless transmit/receive unit
  • PDA personal digital assistant
  • Node-B includes but is not limited to a base station, a site controller, an access point (AP), or any other type of interfacing device capable of operating in a wireless environment.
  • Embodiments described herein are applicable to any wireless communication systems employing discontinuous transmission and/or reception including, but not limited to, evolved high speed packet access (HSPA+) and long term evolution (LTE) of 3GPP systems.
  • HSPA+ evolved high speed packet access
  • LTE long term evolution
  • Figure 1 shows an example UE 110 and Node-B 120 that are configured to control DTX and/or DRX.
  • the UE 110 includes a transceiver 112 and a controller 114.
  • the UE 110 is provided with DTX and/or DRX parameters including an offset for DTX and/or DRX to implement DTX and/or DRX.
  • a DTX pattern and/or a DRX pattern are defined with the parameters.
  • the offset may be a UE_DTX_DRX_Offset for jointly controlling DTX and DRX. Alternatively, the offset may be a separate offset for DTX or DRX.
  • the controller 114 selectively turns on and off the transceiver 112 to discontinuously transmit and/or receive based on the configured parameters.
  • the Node-B 120 includes a transceiver 122 and a scheduler 124.
  • the scheduler 124 may schedule DTX and/or DRX pattern and sends a signal to the UE 110 to modify the UE_DTX_DRX_Offset, (or separate offsets for DTX and/or DRX), for the UE 110 dynamically.
  • the offset parameter adjustment may alleviate congestion by changing offsets of some UEs instead of removing the DRX functionality altogether.
  • the offset parameter adjustment may also allow the Node-B 120 to optimize the uplink capacity by staggering the transmissions of DPCCH of voice-inactive UEs in DTX, if desired.
  • the uplink optimization may not be performed independently of the downlink optimization. Therefore, the Node-B 120 may signal the separate offsets for DTX and/or DRX instead of the UE_DTX_DRX_Offset.
  • the additional cost in terms of downlink overhead of implementing the signaling is small.
  • the Node-B 120 may signal the UE_DTX_DRX_Offset as an HS-
  • the HS_SCCH (type 2) carries "special information" bits (7 bits).
  • the 7-bit special information bits may be used to indicate the UE_DTX_DRX_Offset value.
  • the UE_DTX_DRX_Offset value may vary from 0 to 15, four (4) "special information" bits may be used to indicate the UE_DTX_DRX_Offset value, and the remaining three (3) bits may be used to indicate that the order is related to a change of the UE_DTX_DRX_Offset.
  • a subset of the UE_DTX_DRX_Offset values may be signaled to the UE 110 beforehand, (e.g., through RRC signaling).
  • the UE 110 may be assigned possible UE_DTX_DRX_Offset values of 3 and 12. In this situation, only one bit is required to identify one of the two values, (e.g., "0" can be mapped to the UE_DTX_DRX_Offset value 3 and "1" can be mapped to the UE_DTX_DRX_Offset value 12).
  • the above signaling mechanism may be used for signaling the separate offsets for DTX and/or DRX. In this case, an additional bit is needed to signal whether the offset applies to the DTX or DRX.
  • a DTX or DRX activation command from the Node-B 120 may be used to shift the DTX and/or DRX patterns by mapping the starting point of the DTX and/or DRX pattern to the transmission time of the activation command.
  • the offset may be the UE_DTX_DRX_Offset, or independent offsets for DTX or DRX (depending on whether a DTX or DRX activation command is received, respectively).
  • the offset value may be implicitly reset every time the UE 110 receives or transmits data.
  • the offset value may be reset upon reception of data, (e.g., data on high speed physical downlink shared channel (HS-PDSCH) or on HS-SCCH), or transmission of data, (e.g., data on enhanced dedicated physical data channel (E-DPDCH)), as follows:
  • data e.g., data on high speed physical downlink shared channel (HS-PDSCH) or on HS-SCCH
  • E-DPDCH enhanced dedicated physical data channel
  • Offset S + D
  • S is the sub-frame number at the time the downlink data, (e.g., data on the HS-PDSCH or HS-SCCH, or the like), is received, or the sub-frame number at the time the uplink data, (e.g., data on E-DPDCH, or the like), is transmitted.
  • D is a parameter that may either be fixed or defined by a higher layer.
  • Node-B sends the offset via an HS-SCCH.
  • DRX DRX
  • DTX offset for controlling DTX only
  • DRX offset for controlling DRX only.
  • DRX DRX
  • DTX offset for controlling DTX only
  • DRX offset for controlling DRX only.
  • UE receives the offset via an HS-SCCH.
  • DRX DRX
  • DTX offset for controlling DTX only
  • DRX offset for controlling DRX only.
  • DRX DRX
  • DTX offset for controlling DTX only
  • DRX offset for controlling DRX only.
  • the method of embodiment 28 comprising the UE resetting an offset for DRX when the UE receives downlink data based on a sub-frame number at the time of reception of the downlink data.
  • the Node-B of embodiment 31 comprising a scheduler for scheduling an offset for at least one of DTX and DRX of a UE.
  • the Node-B of embodiment 32 comprising a transceiver for sending the offset to the UE.
  • DRX DRX
  • DTX offset for controlling DTX only
  • DRX offset for controlling DRX only.
  • the Node-B of embodiment 31 comprising a transceiver.
  • the Node-B of embodiment 40 comprising a scheduler for scheduling an offset for at least one of DTX and DRX of a UE, and sending an activation command to the UE.
  • DRX DRX
  • DTX offset for controlling DTX only
  • DRX offset for controlling DRX only.
  • the UE of embodiment 44 comprising a transceiver for receiving an offset for at least one of DTX and DRX from a Node-B while implementing at least one of DTX and DRX.
  • the UE of embodiment 45 comprising a controller for shifting at least one of DTX pattern and DRX pattern based on the received offset.
  • the offset is one of a UE_DTX_DRX_Offset for jointly controlling the DTX and the DRX, a DTX offset for controlling DTX only, and a DRX offset for controlling DRX only.
  • the UE of embodiment 44 comprising a transceiver for receiving an activation command for at least one of DTX and DRX.
  • the UE of embodiment 52 comprising a controller for modifying at least one of DTX offset and DRX offset to shift one of DTX pattern and DRX pattern based on the transmission time of the activation command.
  • UE_DTX_DRX_Offset for jointly controlling the DTX and the DRX, a DTX offset for controlling DTX only, and a DRX offset for controlling DRX only.
  • a UE for controlling discontinuous reception is a UE for controlling discontinuous reception.
  • the UE of embodiment 59 comprising a transceiver.
  • the UE as in any one of embodiments 59-60, comprising a controller for resetting an offset for DRX when the UE receives downlink data based on a sub-frame number at the time of reception of the downlink data.
  • ROM read only memory
  • RAM random access memory
  • register cache memory
  • semiconductor memory devices magnetic media such as internal hard disks and removable disks, magneto- optical media, and optical media such as CD-ROM disks, and digital versatile disks (DVDs).
  • Suitable processors include, by way of example, a general purpose processor, a special purpose processor, a conventional processor, a digital signal processor (DSP), a plurality of microprocessors, one or more microprocessors in association with a DSP core, a controller, a microcontroller, Application Specific Integrated Circuits (ASICs), Field Programmable Gate Arrays (FPGAs) circuits, any other type of integrated circuit (IC), and/or a state machine.
  • a processor in association with software may be used to implement a radio frequency transceiver for use in a wireless transmit receive unit (WTRU), user equipment (UE), terminal, base station, radio network controller (RNC), or any host computer.
  • WTRU wireless transmit receive unit
  • UE user equipment
  • RNC radio network controller
  • the WTRU may be used in conjunction with modules, implemented in hardware and/or software, such as a camera, a video camera module, a videophone, a speakerphone, a vibration device, a speaker, a microphone, a television transceiver, a hands free headset, a keyboard, a Bluetooth® module, a frequency modulated (FM) radio unit, a liquid crystal display (LCD) display unit, an organic light-emitting diode (OLED) display unit, a digital music player, a media player, a video game player module, an Internet browser, and/or any wireless local area network (WLAN) module.
  • modules implemented in hardware and/or software, such as a camera, a video camera module, a videophone, a speakerphone, a vibration device, a speaker, a microphone, a television transceiver, a hands free headset, a keyboard, a Bluetooth® module, a frequency modulated (FM) radio unit, a liquid crystal display (LCD) display unit, an organic light-emit

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Computer Security & Cryptography (AREA)
  • Mobile Radio Communication Systems (AREA)
  • Communication Control (AREA)

Abstract

A method and apparatus for controlling discontinuous transmission and reception are disclosed. A Node-B schedules an offset for discontinuous transmission (DTX) and/or discontinuous reception (DRX) for a user equipment (UE) and sends the offset to the UE. The UE then shifts the DTX and/or DRX pattern based on the received offset. The UE may modify the offset based on the transmission time of an activation command for DTX and DRX. The UE may modify an offset for DTX and DRX to shift the DTX pattern and DRX pattern when the UE receives downlink data or transmits uplink data based on a sub-frame number at the time of the downlink reception and uplink transmission.

Description

[0001] METHOD AND APPARATUS FOR CONTROLLING
DISCONTINUOUS TRANSMISSION AND RECEPTION
[0002] FIELD OF INVENTION
[0003] The present invention is related to wireless communications.
[0004] BACKGROUND
[0005] Third generation partnership project (3GPP) release 7 specifications introduce continuous packet connectivity (CPC) enhancements. CPC is a mode that a user equipment (UE) is allocated with resources, but transmits and/or receives discontinuously, (i.e., transmits and/or receives only in a subset of uplink and downlink sub-frames), during data inactivity while continuous operation is possible, (i.e., may transmit and receive in all sub-frames), whenever needed. The discontinuous uplink transmission and downlink reception increases system capacity and battery life of the UE.
[0006] For implementing the CPC, a higher layer, (e.g., radio resource control (RRC) layer), defines parameters for discontinuous transmission (DTX) and discontinuous reception (DRX) to set up the transmission and reception patterns and triggers. One of the parameters is "UE_DTX_DRX_Offset" that jointly controls an uplink dedicated physical control channel (DPCCH) transmission offset and a downlink high speed shared control channel (HS- SCCH) reception offset in sub-frames. By controlling the offsets of each UE, the network can ensure that the transmission and reception instants of different UEs are adequately spread over time.
[0007] DTX and DRX may be used for different applications. One of the applications is voice over Internet protocol (VoIP). With VoIP, the UE may be inactive in reception and/or transmission during a significant fraction of the time not only during uplink and downlink silence periods but also during voice active periods under certain conditions.
[0008] On the uplink, enabling DTX results in the UE transmitting the uplink DPCCH only according to the transmission pattern provided that certain conditions are satisfied, (e.g., no enhanced dedicated channel (E-DCH) transmission, no need to transmit pre-amble or post-amble, no high speed dedicated physical control channel (HS-DPCCH) transmission, and the like). The transmission pattern is defined based on the UE_DTX_DRX_Offset and a connection frame number (CFN) of the UE. Enabling DTX results in a direct capacity improvement since less interference is generated on the uplink. Such reduction of interference is achieved even during voice-active periods on the uplink if the UE is sufficiently close to a Node-B to be able to use a 2 ms transmission time interval (TTI), because not all hybrid automatic repeat request (HAKQ) processes need to be used with the voice application with the 2 ms TTI. [0009] On the downlink, enabling DRX results in the UE turning on its receiver only during user or control data reception and for a defined period afterwards, after which the UE is allowed to turn its receiver off according to a reception pattern. This allows the UE to save battery during voice-inactive periods on the downlink. This also allows UEs that are sufficiently close to the cell center to turn off their receivers intermittently during voice-active periods, since these UEs may receive at high instantaneous data rates and therefore during a fraction of the available TTIs. For instance, the RRC may configure DRX with the parameter Inactivity_Threshold_for_UE_DRX_cycle set to 0 sub- frame and the UE_DRX_cycle parameter set to 4 sub-frames. Thereafter, the Node B may schedule transmission for the UE only during the sub-frames where the UE should wake-up according to the pattern (1 out of 4). [0010] Periods of activity and inactivity in a typical voice session alternate at a frequency that is generally too high to be tracked by RRC signaling without incurring unacceptable signaling load and delays. In accordance with one of the CPC implementation proposals, the UE_DTX_DRX_Offset is set by a higher layer, such as RRC. This means that during the course of a voice connection, the UE_DTX_DRX_Offset parameter remains to a fixed value. [0011] Such restriction may reduce significantly the potential battery savings obtainable by the use of DRX on the downlink when the cell is operating near the maximum capacity because the use of DRX constrains the Node-B to schedule the UE during certain subsets of TTI only. As periods of voice activity and inactivity are not correlated between UEs, it will frequently happen that there will be an above-average number of voice-active UEs that can be scheduled for transmission in a given set of periodically spaced TTIs. Such situation would result in congestion (high latency) for the concerned UEs unless the Node-B disables the DRX for some of these UEs to schedule their transmissions in other TTIs.
[0012] On the uplink, the fact that the UE_DTX_DRX_Offset parameter is fixed is sub-optimal from the system capacity point-of-view because the system capacity may only be maximized if the set of voice-inactive UEs have staggered transmission patterns (with approximately equal number of voice-inactive UEs transmitting the DPCCH at a given time). This situation cannot be realized with a fixed UE_DTX_DRX_Offset since the set of voice-inactive UEs changes dynamically.
[0013] SUMMARY
[0014] A method and apparatus for controlling discontinuous transmission and reception are disclosed. A Node-B schedules an offset for DTX and/or DRX for a UE and sends the offset to the UE. The UE then shifts the DTX and/or DRX pattern based on the received offset. The UE may modify the offset based on the transmission time of an activation command for DTX and DRX. The UE may modify an offset for DTX and DRX to shift the DTX pattern and DRX pattern when the UE receives downlink data or transmits uplink data based on a sub- frame number at the time of the downlink reception and uplink transmission.
[0015] BRIEF DESCRIPTION OF THE DRAWING
[0016] A more detailed understanding may be had from the following description, given by way of example and to be understood in conjunction with the accompanying drawing wherein: [0017] Figure 1 shows an example UE and Node-B that are configured to control DTX and/or DRX.
[0018] DETAILED DESCRIPTION
[0019] When referred to hereafter, the terminology "UE" includes but is not limited to a wireless transmit/receive unit (WTRU), a mobile station, a fixed or mobile subscriber unit, a pager, a cellular telephone, a personal digital assistant (PDA), a computer, or any other type of user device capable of operating in a wireless environment. When referred to hereafter, the terminology "Node-B" includes but is not limited to a base station, a site controller, an access point (AP), or any other type of interfacing device capable of operating in a wireless environment.
[0020] Embodiments described herein are applicable to any wireless communication systems employing discontinuous transmission and/or reception including, but not limited to, evolved high speed packet access (HSPA+) and long term evolution (LTE) of 3GPP systems.
[0021] Figure 1 shows an example UE 110 and Node-B 120 that are configured to control DTX and/or DRX. The UE 110 includes a transceiver 112 and a controller 114. The UE 110 is provided with DTX and/or DRX parameters including an offset for DTX and/or DRX to implement DTX and/or DRX. A DTX pattern and/or a DRX pattern are defined with the parameters. The offset may be a UE_DTX_DRX_Offset for jointly controlling DTX and DRX. Alternatively, the offset may be a separate offset for DTX or DRX. The controller 114 selectively turns on and off the transceiver 112 to discontinuously transmit and/or receive based on the configured parameters.
[0022] The Node-B 120 includes a transceiver 122 and a scheduler 124.
The scheduler 124 may schedule DTX and/or DRX pattern and sends a signal to the UE 110 to modify the UE_DTX_DRX_Offset, (or separate offsets for DTX and/or DRX), for the UE 110 dynamically. The offset parameter adjustment may alleviate congestion by changing offsets of some UEs instead of removing the DRX functionality altogether. The offset parameter adjustment may also allow the Node-B 120 to optimize the uplink capacity by staggering the transmissions of DPCCH of voice-inactive UEs in DTX, if desired. The uplink optimization may not be performed independently of the downlink optimization. Therefore, the Node-B 120 may signal the separate offsets for DTX and/or DRX instead of the UE_DTX_DRX_Offset. The additional cost in terms of downlink overhead of implementing the signaling is small.
[0023] The Node-B 120 may signal the UE_DTX_DRX_Offset as an HS-
SCCH order via an HS-SCCH. For example, the HS_SCCH (type 2) carries "special information" bits (7 bits). The 7-bit special information bits may be used to indicate the UE_DTX_DRX_Offset value. For example, if the UE_DTX_DRX_Offset value may vary from 0 to 15, four (4) "special information" bits may be used to indicate the UE_DTX_DRX_Offset value, and the remaining three (3) bits may be used to indicate that the order is related to a change of the UE_DTX_DRX_Offset.
[0024] Alternatively, a subset of the UE_DTX_DRX_Offset values may be signaled to the UE 110 beforehand, (e.g., through RRC signaling). For example, the UE 110 may be assigned possible UE_DTX_DRX_Offset values of 3 and 12. In this situation, only one bit is required to identify one of the two values, (e.g., "0" can be mapped to the UE_DTX_DRX_Offset value 3 and "1" can be mapped to the UE_DTX_DRX_Offset value 12). With this scheme, only one "special information" bit is used to indicate the UE_DTX_DRX_Offset value and six bits are left for other signaling information on the HS-SCCH type 2 channel. [0025] The above signaling mechanism may be used for signaling the separate offsets for DTX and/or DRX. In this case, an additional bit is needed to signal whether the offset applies to the DTX or DRX.
[0026] In accordance with another embodiment, a DTX or DRX activation command from the Node-B 120 may be used to shift the DTX and/or DRX patterns by mapping the starting point of the DTX and/or DRX pattern to the transmission time of the activation command. For instance, the offset may be modified upon reception of a DTX or DRX activation command as follows: Offset = S + D; where S is the sub-frame number at the time the activation command is received, and D is a parameter that is either fixed or defined by a higher layer. The offset may be the UE_DTX_DRX_Offset, or independent offsets for DTX or DRX (depending on whether a DTX or DRX activation command is received, respectively).
[0027] In accordance with another embodiment, the offset value may be implicitly reset every time the UE 110 receives or transmits data. For instance, the offset value may be reset upon reception of data, (e.g., data on high speed physical downlink shared channel (HS-PDSCH) or on HS-SCCH), or transmission of data, (e.g., data on enhanced dedicated physical data channel (E-DPDCH)), as follows:
Offset = S + D where S is the sub-frame number at the time the downlink data, (e.g., data on the HS-PDSCH or HS-SCCH, or the like), is received, or the sub-frame number at the time the uplink data, (e.g., data on E-DPDCH, or the like), is transmitted. D is a parameter that may either be fixed or defined by a higher layer. [0028] Embodiments.
[0029] 1. A method for controlling discontinuous transmission and receptionl.
[0030] 2. The method of embodiment 1 comprising a Node-B scheduling an offset for at least one of DTX and DRX of a UE.
[0031] 3. The method of embodiment 2 comprising the Node-B sending the offset to the UE.
[0032] 4. The method of embodiment 3 wherein the offset enables at least one of DTX pattern and DRX pattern to be shifted based on the received offset.
[0033] 5. The method as in any one of embodiments 3-4, wherein the
Node-B sends the offset via an HS-SCCH.
[0034] 6. The method of embodiment 5 wherein the Node-B uses special information bits in a type 2 HS-SCCH to send the offset. [0035] 7. The method of embodiment 6 wherein four (4) bits of the special information bits are used to indicate the offset and the remaining special information bits are used to indicate that the HS-SCCH transmission is related to a change of the offset.
[0036] 8. The method as in any one of embodiments 6-7, further comprising the Node-B assigning a subset of offset values to the UE beforehand.
[0037] 9. The method of embodiment 8 wherein the special information bits are used to indicate one of the subset of offset values.
[0038] 10. The method as in any one of embodiments 2-9, wherein the offset is one of a UE_DTX_DRX_Offset for jointly controlling the DTX and the
DRX, a DTX offset for controlling DTX only, and a DRX offset for controlling DRX only.
[0039] 11. The method of embodiment 2 comprising the Node-B sending an activation command to the UE.
[0040] 12. The method of embodiment 11 wherein the offset is modified to shift at least one of DTX pattern and DRX pattern based on the transmission time of the activation command.
[0041] 13. The method as in any one of embodiments 11-12, wherein the offset is one of a UE_DTX_DRX_Offset for jointly controlling the DTX and the
DRX, a DTX offset for controlling DTX only, and a DRX offset for controlling DRX only.
[0042] 14. A method for controlling discontinuous transmission and reception.
[0043] 15. The method of embodiment 14 comprising a UE receiving an offset for at least one of DTX and DRX.
[0044] 16. The method of embodiment 15 comprising the UE shifting at least one of DTX pattern and DRX pattern based on the offset.
[0045] 17. The method as in any one of embodiments 15-16, wherein the
UE receives the offset via an HS-SCCH.
[0046] 18. The method of embodiment 17 wherein special information bits in a type 2 HS-SCCH is used to send the offset. [0047] 19. The method of embodiment 18 wherein four (4) bits of the special information bits are used to indicate the offset and the remaining special information bits are used to indicate that the HS-SCCH transmission is related to a change of the offset.
[0048] 20. The method as in any one of embodiments 18-19, wherein the special information bits are used to indicate one of a plurality of pre-assigned offset values.
[0049] 21. The method as in any one of embodiments 15-20, wherein the offset is one of a UE_DTX_DRX_Offset for jointly controlling the DTX and the
DRX, a DTX offset for controlling DTX only, and a DRX offset for controlling DRX only.
[0050] 22. The method of embodiment 14 comprising a UE receiving an activation command for at least one of DTX and DRX.
[0051] 23. The method of embodiment 22 comprising the UE modifying an offset for at least one of DTX and DRX to shift at least one of DTX pattern and
DRX pattern based on the transmission time of the activation command.
[0052] 24. The method as in any one of embodiments 22-23, wherein the offset is one of a UE_DTX_DRX_Offset for jointly controlling the DTX and the
DRX, a DTX offset for controlling DTX only, and a DRX offset for controlling DRX only.
[0053] 25. The method of embodiment 14 comprising a UE implementing
DTX.
[0054] 26. The method of embodiment 25 comprising the UE resetting an offset for DTX when the UE transmits uplink data based on a sub-frame number at the time of transmission of the uplink data.
[0055] 27. The method of embodiment 26 wherein the uplink transmission is via an E-DPDCH.
[0056] 28. The method of embodiment 14 comprising a UE implementing
DRX. [0057] 29. The method of embodiment 28 comprising the UE resetting an offset for DRX when the UE receives downlink data based on a sub-frame number at the time of reception of the downlink data.
[0058] 30. The method of embodiment 29 wherein the downlink reception is via one of an HS-PDSCH and an HS-SCCH.
[0059] 31. A Node-B for controlling discontinuous transmission and reception.
[0060] 32. The Node-B of embodiment 31 comprising a scheduler for scheduling an offset for at least one of DTX and DRX of a UE.
[0061] 33. The Node-B of embodiment 32 comprising a transceiver for sending the offset to the UE.
[0062] 34. The Node-B of embodiment 33, wherein the offset enables at least one of DTX pattern and DRX pattern to be shifted based on the received offset.
[0063] 35. The Node-B as in any one of embodiments 33-34, wherein the transceiver sends the offset via an HS-SCCH.
[0064] 36. The Node-B of embodiment 35 wherein the transceiver uses special information bits in a type 2 HS-SCCH to send the offset.
[0065] 37. The Node-B of embodiment 36 wherein four (4) bits of the special information bits are used to indicate the offset and the remaining special information bits are used to indicate that the HS-SCCH transmission is related to a change of the offset.
[0066] 38. The Node-B as in any one of embodiments 32-37, wherein the scheduler assigns a subset of offset values to the UE beforehand, wherein the special information bits are used to indicate one of the subset of offset values.
[0067] 39. The Node-B as in any one of embodiments 32-38, wherein the offset is one of a UE_DTX_DRX_Offset for jointly controlling the DTX and the
DRX, a DTX offset for controlling DTX only, and a DRX offset for controlling DRX only.
[0068] 40. The Node-B of embodiment 31 comprising a transceiver. [0069] 41. The Node-B of embodiment 40 comprising a scheduler for scheduling an offset for at least one of DTX and DRX of a UE, and sending an activation command to the UE.
[0070] 42. The Node-B of embodiment 41, wherein the offset is modified to shift at least one of DTX pattern and DRX pattern based on the transmission time of the activation command.
[0071] 43. The Node-B as in any one of embodiments 41-42, wherein the offset is one of a UE_DTX_DRX_Offset for jointly controlling the DTX and the
DRX, a DTX offset for controlling DTX only, and a DRX offset for controlling DRX only.
[0072] 44. A UE for controlling discontinuous transmission and reception.
[0073] 45. The UE of embodiment 44 comprising a transceiver for receiving an offset for at least one of DTX and DRX from a Node-B while implementing at least one of DTX and DRX.
[0074] 46. The UE of embodiment 45 comprising a controller for shifting at least one of DTX pattern and DRX pattern based on the received offset.
[0075] 47. The UE as in any one of embodiments 45-46, wherein the transceiver receives the offset via an HS-SCCH.
[0076] 48. The UE of embodiment 47 wherein special information bits in a type 2 HS-SCCH is used to send the offset.
[0077] 49. The UE of embodiment 48 wherein four (4) bits of the special information bits are used to indicate the offset and the remaining special information bits are used to indicate that the HS-SCCH transmission is related to a change of the offset.
[0078] 50. The UE as in any one of embodiments 48-49, wherein the special information bits are used to indicate one of a plurality of pre-assigned offset values.
[0079] 51. The UE as in any one of embodiments 45-50, wherein the offset is one of a UE_DTX_DRX_Offset for jointly controlling the DTX and the DRX, a DTX offset for controlling DTX only, and a DRX offset for controlling DRX only.
[0080] 52. The UE of embodiment 44 comprising a transceiver for receiving an activation command for at least one of DTX and DRX.
[0081] 53. The UE of embodiment 52 comprising a controller for modifying at least one of DTX offset and DRX offset to shift one of DTX pattern and DRX pattern based on the transmission time of the activation command.
[0082] 54. The UE of embodiment 53 wherein the offset is one of a
UE_DTX_DRX_Offset for jointly controlling the DTX and the DRX, a DTX offset for controlling DTX only, and a DRX offset for controlling DRX only.
[0083] 55. A UE for controlling discontinuous transmission.
[0084] 56. The UE of embodiment 55 comprising a transceiver.
[0085] 57. The UE as in any one of embodiments 55-56, comprising a controller for resetting an offset for DTX when the UE transmits uplink data based on a sub-frame number at the time of transmission of the uplink data.
[0086] 58. The UE of embodiment 57 wherein the uplink transmission is via an E-DPDCH.
[0087] 59. A UE for controlling discontinuous reception.
[0088] 60. The UE of embodiment 59 comprising a transceiver.
[0089] 61. The UE as in any one of embodiments 59-60, comprising a controller for resetting an offset for DRX when the UE receives downlink data based on a sub-frame number at the time of reception of the downlink data.
[0090] 62. The UE of embodiment 61 wherein the downlink reception is via one of an HS-PDSCH and an HS-SCCH.
[0091] Although the features and elements are described in the preferred embodiments in particular combinations, each feature or element can be used alone without the other features and elements of the preferred embodiments or in various combinations with or without other features and elements. The methods or flow charts provided may be implemented in a computer program, software, or firmware tangibly embodied in a computer-readable storage medium for execution by a general purpose computer or a processor. Examples of computer- readable storage mediums include a read only memory (ROM), a random access memory (RAM), a register, cache memory, semiconductor memory devices, magnetic media such as internal hard disks and removable disks, magneto- optical media, and optical media such as CD-ROM disks, and digital versatile disks (DVDs).
[0092] Suitable processors include, by way of example, a general purpose processor, a special purpose processor, a conventional processor, a digital signal processor (DSP), a plurality of microprocessors, one or more microprocessors in association with a DSP core, a controller, a microcontroller, Application Specific Integrated Circuits (ASICs), Field Programmable Gate Arrays (FPGAs) circuits, any other type of integrated circuit (IC), and/or a state machine. [0093] A processor in association with software may be used to implement a radio frequency transceiver for use in a wireless transmit receive unit (WTRU), user equipment (UE), terminal, base station, radio network controller (RNC), or any host computer. The WTRU may be used in conjunction with modules, implemented in hardware and/or software, such as a camera, a video camera module, a videophone, a speakerphone, a vibration device, a speaker, a microphone, a television transceiver, a hands free headset, a keyboard, a Bluetooth® module, a frequency modulated (FM) radio unit, a liquid crystal display (LCD) display unit, an organic light-emitting diode (OLED) display unit, a digital music player, a media player, a video game player module, an Internet browser, and/or any wireless local area network (WLAN) module.

Claims

CLAIMS What is claimed is:
1. A method for controlling discontinuous transmission and reception, the method comprising: a Node-B scheduling an offset for at least one of discontinuous transmission (DTX) and discontinuous reception (DRX) of a user equipment (UE); and the Node-B sending the offset to the UE wherein the offset enables at least one of DTX pattern and DRX pattern to be shifted based on the received offset.
2. The method of claim 1 wherein the Node-B sends the offset via a high speed shared control channel (HS-SCCH).
3. The method of claim 2 wherein the Node-B uses special information bits in a type 2 HS-SCCH to send the offset.
4. The method of claim 3 wherein four (4) bits of the special information bits are used to indicate the offset and the remaining special information bits are used to indicate that the HS-SCCH transmission is related to a change of the offset.
5. The method of claim 3 further comprising: the Node-B assigning a subset of offset values to the UE beforehand, wherein the special information bits are used to indicate one of the subset of offset values.
6. The method of claim 1 wherein the offset is one of a UE_DTX_DRX_Offset for jointly controlling the DTX and the DRX, a DTX offset for controlling DTX only, and a DRX offset for controlling DRX only.
7. A method for controlling discontinuous transmission and reception, the method comprising: a Node-B scheduling an offset for at least one of discontinuous transmission (DTX) and discontinuous reception (DRX) of a user equipment (UE); and the Node-B sending an activation command to the UE, wherein the offset is modified to shift at least one of DTX pattern and DRX pattern based on the transmission time of the activation command.
8. The method of claim 7 wherein the offset is one of a UE_DTX_DRX_Offset for jointly controlling the DTX and the DRX, a DTX offset for controlling DTX only, and a DRX offset for controlling DRX only.
9. A method for controlling discontinuous transmission and reception, the method comprising: a user equipment (UE) receiving an offset for at least one of discontinuous transmission (DTX) and discontinuous reception (DRX); and the UE shifting at least one of DTX pattern and DRX pattern based on the offset.
10. The method of claim 9 wherein the UE receives the offset via a high speed shared control channel (HS-SCCH).
11. The method of claim 10 wherein special information bits in a type 2 HS-SCCH is used to send the offset.
12. The method of claim 11 wherein four (4) bits of the special information bits are used to indicate the offset and the remaining special information bits are used to indicate that the HS-SCCH transmission is related to a change of the offset.
13. The method of claim 11 wherein the special information bits are used to indicate one of a plurality of pre-assigned offset values.
14. The method of claim 9 wherein the offset is one of a UE_DTX_DRX_Offset for jointly controlling the DTX and the DRX, a DTX offset for controlling DTX only, and a DRX offset for controlling DRX only.
15. A method for controlling discontinuous transmission and reception, the method comprising: a user equipment (UE) receiving an activation command for at least one of discontinuous transmission (DTX) and discontinuous reception (DRX); and the UE modifying an offset for at least one of DTX and DRX to shift at least one of DTX pattern and DRX pattern based on the transmission time of the activation command.
16. The method of claim 15 wherein the offset is one of a UE_DTX_DRX_Offset for jointly controlling the DTX and the DRX, a DTX offset for controlling DTX only, and a DRX offset for controlling DRX only.
17. A method for controlling discontinuous transmission and reception, the method comprising: a user equipment (UE) implementing discontinuous transmission (DTX); and the UE resetting an offset for DTX when the UE transmits uplink data based on a sub-frame number at the time of transmission of the uplink data.
18. The method of claim 17 wherein the uplink transmission is via an enhanced dedicated physical data channel (E-DPDCH).
19. A method for controlling discontinuous transmission and reception, the method comprising: a user equipment (UE) implementing discontinuous reception (DRX); and the UE resetting an offset for DRX when the UE receives downlink data based on a sub-frame number at the time of reception of the downlink data.
20. The method of claim 19 wherein the downlink reception is via one of a high speed physical downlink shared channel (HS-PDSCH) and a high speed shared control channel (HS-SCCH).
21. A Node-B for controlling discontinuous transmission and reception, the Node-B comprising: a scheduler for scheduling an offset for at least one of discontinuous transmission (DTX) and discontinuous reception (DRX) of a user equipment (UE); and a transceiver for sending the offset to the UE, wherein the offset enables at least one of DTX pattern and DRX pattern to be shifted based on the received offset.
22. The Node-B of claim 21 wherein the transceiver sends the offset via a high speed shared control channel (HS-SCCH).
23. The Node-B of claim 22 wherein the transceiver uses special information bits in a type 2 HS-SCCH to send the offset.
24. The Node-B of claim 23 wherein four (4) bits of the special information bits are used to indicate the offset and the remaining special information bits are used to indicate that the HS-SCCH transmission is related to a change of the offset.
25. The Node-B of claim 23 wherein the scheduler assigns a subset of offset values to the UE beforehand, wherein the special information bits are used to indicate one of the subset of offset values.
26. The Node-B of claim 21 wherein the offset is one of a UE_DTX_DRX_Offset for jointly controlling the DTX and the DRX, a DTX offset for controlling DTX only, and a DRX offset for controlling DRX only.
27. A Node-B for controlling discontinuous transmission and reception, the Node-B comprising: a transceiver; and a scheduler for scheduling an offset for at least one of discontinuous transmission (DTX) and discontinuous reception (DRX) of a user equipment (UE), and sending an activation command to the UE, wherein the offset is modified to shift at least one of DTX pattern and DRX pattern based on the transmission time of the activation command.
28. The Node-B of claim 27 wherein the offset is one of a UE_DTX_DRX_Offset for jointly controlling the DTX and the DRX, a DTX offset for controlling DTX only, and a DRX offset for controlling DRX only.
29. A user equipment (UE) for controlling discontinuous transmission and reception, the UE comprising: a transceiver for receiving an offset for at least one of discontinuous transmission (DTX) and discontinuous reception (DRX) from a Node-B while implementing at least one of DTX and DRX; and a controller for shifting at least one of DTX pattern and DRX pattern based on the received offset.
30. The UE of claim 29 wherein the transceiver receives the offset via a high speed shared control channel (HS-SCCH).
31. The UE of claim 30 wherein special information bits in a type 2 HS- SCCH is used to send the offset.
32. The UE of claim 30 wherein four (4) bits of the special information bits are used to indicate the offset and the remaining special information bits are used to indicate that the HS-SCCH transmission is related to a change of the offset.
33. The UE of claim 31 wherein the special information bits are used to indicate one of a plurality of pre-assigned offset values.
34. The UE of claim 29 wherein the offset is one of a UE_DTX_DRX_Offset for jointly controlling the DTX and the DRX, a DTX offset for controlling DTX only, and a DRX offset for controlling DRX only.
35. A user equipment (UE) for controlling discontinuous transmission and reception, the UE comprising: a transceiver for receiving an activation command for at least one of discontinuous transmission (DTX) and discontinuous reception (DRX); and a controller for modifying at least one of DTX offset and DRX offset to shift one of DTX pattern and DRX pattern based on the transmission time of the activation command.
36. The UE of claim 35 wherein the offset is one of a UE_DTX_DRX_Offset for jointly controlling the DTX and the DRX, a DTX offset for controlling DTX only, and a DRX offset for controlling DRX only.
37. A user equipment (UE) for controlling discontinuous transmission, the UE comprising: a transceiver; and a controller for resetting an offset for discontinuous transmission (DTX) when the UE transmits uplink data based on a sub-frame number at the time of transmission of the uplink data.
38. The UE of claim 37 wherein the uplink transmission is via an enhanced dedicated physical data channel (E-DPDCH).
39. A user equipment (UE) for controlling discontinuous reception, the UE comprising: a transceiver; and a controller for resetting an offset for discontinuous reception (DRX) when the UE receives downlink data based on a sub-frame number at the time of reception of the downlink data.
40. The UE of claim 39 wherein the downlink reception is via one of a high speed physical downlink shared channel (HS-PDSCH) and a high speed shared control channel (HS-SCCH).
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TWI420934B (en) 2013-12-21
US7941626B2 (en) 2011-05-10
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AR064103A1 (en) 2009-03-11
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JP4869405B2 (en) 2012-02-08
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US20080132230A1 (en) 2008-06-05
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WO2008069950A2 (en) 2008-06-12
ATE472918T1 (en) 2010-07-15

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